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,SAMUEL W. HUDSON', or BEAVER MEADOW, PENNSYLVANIA. l Letters .PatentNo. 68,748, dated September l0, 1867. v

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To ALE WHoM 1r MAY coNcEnN: i A A A Be it known that I, SAMUEL W.HUDSON, oi Beaver Meadow, in the county of Carbon, and State o fPennsylvania, have invented a' new and useful Steam-Port; and I dohereby declare the following to` be a full, clear,

and exact description of the sameyreference being had to theaccompanying drawings, which are'made a para of this specication. V y

The subject of this invention is a steam-cylinder, the ports of whichare constructed with vertically oblique passages and with sides parallelto the axis of the cylinder, the object being to introduce the steam andapply the pressure in a gradually-increasing ratio during the first partof the pistons movement, this provision being especially beneficial incases where 4the piston acts directly without the intervention of aily-wheel orother means for insuring a uniform motion, Yasindirect-acting steam-pumps, blowers, ttc. o

.Figure I is a vertical longitudinal section of a Vsteam-,cylinder andside elevation ofthe piston.`

Figure 2 is a plan of the cylinder.

Similar letters of reference indicate corresponding parts in the twoiignres,

In the drawings, A is the cylinder` and B B the cylinder-heads; C thepiston, and Dthe customary stuffing-box through which the piston-rodworks. E E are the ports or openings through which the steam is admittedto and discharged from the interiorlcf the cylinder. That -side or wallofeach steam-port which is 'nearest to the adjacent end of' the cylinderis oblique vertically from its lower terminus tea point in somewhatclose proximity tothe upper or outer edge of thol port where the saidoblique part e may join'the vertical part el, as seen in iig. 1. 'Thepart eI and the diametrically opposite wall c2 form the ends of thesteam-port, the sides ea e3 beingparallel with the airis oi' thecylinder. Let it be supposed that the piston C is moving toward thecylinder-head B, and that it has reached the position represented intig. I( By reason of the above-described construction it is apparentthat under this position oi' the piston the port Ewill admit less steamAto the cylinder than it would `underthc ordinary construction. Duringthe iirst part of the pistons movement theobliquc portion e of the sidee el effects a diminution in the quantity of steam admitted to thecylinder by as much ns the difference between the distance from the topof face c and. the nearest point on e,'andbetween the face c --and thelower extremity of'e, the latter measurement denoting the capacity of asteam-passage having all its sdesvcrtical, as in the ordinaryconstruction. Hence, as the piston gradually uncovers thesteam-port E,the steam, entering at rst i'n a very limited quantity, is supplied ,ina constantly-increasing ratio until the face e of the piston reacheshthevertical plane of el, when the continued motion ofthe piston completelyopens thc 'port and permits the entrance of as much steam as theeapacitylof the port will admtof. making the sides e of the oblongsteam-port E parallel with the axis of the cylinder I provide a furthermeans of supplying the steam more gradually to the cylinder, as the portthus made will be opened to asinaller extent in a given time than a porthaving its long sides at right angles to the axis of the cylinder.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The narrow steam-openings E E, arranged lengthwise on the interiorsurface of 4the cylinder, so as. to be gradually uncovered by the motionof the steam-piston, as herein described.

2. A vertically oblique wall or side e to the steam-port, to adapt thesteam-passage to enlarge innn increusfing 'ratio as said passage isopened by the piston for the admission of steam to the cylinder",substantially as described. Y Y

To'theabove specification of my invention I have signed my hand this20th daynot` Juno, 1867.

' i SAMUELW. HUDSON..

Witnesses:

OCTAVIUS KNIenr, 'JAMES L. EWIN.

